Just loaded 10.3 and testing the MAC Finder app.
Using my pc mc, and placing all the correct SNMP stings in the list, as well as just selecting the switch this pc resides.
The tool fails to find the mac? This is a 3750 stack, if I ssh into the switch and do a sho mac it finds it?
Does the tool have any issues finding devices behind IP Phones? Though it shouldn't really matter.
-J